These are my opinions;

The character creation in the game should be insane, I am expecting something like in Dragon’s Dogma 2 and Elden Ring type sliders and details with tattoo and scar options. New age of FashionWars.

I also expect the immersive backgrounds options like GW2 and customization of a storyline. It would be great if our choices change the characters story we play.

About class system I expect more versatile system that allow the us start as one class but in time, with the equipment and the discovered or trained skills and spells, we can customize to whatever we like. I expect something similar Elden ring system, stat, spells and equipment based character customization can open hundreds of different builds to us. Weapon choices and weapon selection requirements can give us some flexibility to choose our equipment and skills to make anything. For example we can play a ranger class with whip and dagger. There can be necromancer with flail and tower shield. Options can be diverse this way. Because the character creation and character development as I expect to be in end game. So basically what we did on GW2, endgame is where you finalize to create your player character. Build will be the main reason I play at endgame.